Manhole covers are made of cast iron. These covers need to be heavy so that when vehicles drive over them, they do not become dislodged. Manhole covers normally weigh 100+ pounds each. Some have open pick holes which allow water to enter the manhole. Others have concealed pick holes which do not go all the way through the cover or lift handles such as drop handles or ring handles. Manhole covers can be bolted to the frame for security reasons. Manhole covers can also have a gasket on the bottom of the cover and bolted to the frame which is normally considered watertight.   1. Class: A15, B125, C250, D400, E600 and F900. 2. Design Standard:  BS EN124:1994. 3. Material grade: GGG500/7. 4. Test: testing before shipping for the smooth surface and loading. 5. Coating: coating black bitumen, or coating as customers' requirements. 6. Certificate: BSI Kite Mark, SGS, ISO9001,BV...  

Bearing Class / Loading Capacity of Cast Iron Manhole Covers
Class	Apply to	Bearing	Remarks
EN124-A15	Areas where only passed by Pedestrians and Bicycles.	15KN
EN124-B125	Footways, parking lot or similar areas.	125KN	HOT-SELLING
EN124-C250	The edge combinative area of vehicle road and the pavement.	250KN
EN124-D400	Vehicle area and urban arterial road.	400KN	HOT-SELLING
EN124-E600	Shipping port and parking apron area.	600KN
EN124-F900	Airplane taxiway and huge dock.	900KN